Polished Green Opal slab GRN112 lemon chrysoprase brown iron oxides and druzy

brown iron oxides and druzy quartz pockets

cut and polished on one side with a cut base so that it stands vertically

Weight 591 grams

Approximate dimensions at widest points 235 mm  x 140 mm  x 13 mm thick

160 mm x 75 mm x 70 mm

Polished Green Opal slab GRN112 lemon chrysoprase brown iron oxides and druzyGRN112 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 90 mm x 10 mm thick Weighs 171 grams. Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. The green colouration is caused by traces of nickel and or chromium. Sometimes it exhibits striking contrasting veins of magnesite..